Connection issues, Lost MDD, 100% packet loss

[jwither42]

Hi Connection dropping stable for weeks but now unreliable ?  Log :

Using Hub in Modem mode with Draytek 2862.

Latest :

Time Priority Description

03/08/2021 16:05:59	Warning!	RCS Partial Service;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:52:16	Error	Service Delete Response rejected - Invalid Transaction;CM-MAC=;CMTS-MAC;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:50:1	Warning!	Lost MDD Timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:46:41	Error	Service Add Ack rejected - Invalid transaction ID;CM-MAC=CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;

Time	Priority	Description
03/08/2021 15:36	Warning!	RCS Partial Service;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:35	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:35	Warning!	RCS Partial Service;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:34	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:33	Error	Service Change Response rejected - Invalid transaction ID;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:31	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:31	Warning!	RCS Partial Service;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:29	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:28	Warning!	RCS Partial Service;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:28	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:27	Warning!	RCS Partial Service;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:27	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:27	Warning!	RCS Partial Service;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:27	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:26	Warning!	RCS Partial Service;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:11	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 15:08	critical	No Ranging Response received - T3 time-out;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 14:58	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 14:56	Warning!	RCS Partial Service;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;
03/08/2021 14:56	Warning!	Lost MDD Timeout;CM-MAC=YY;CMTS-MAC=xx;CM-QOS=1.1;CM-VER=3.0;

Graph for Broadband Quality (thinkbroadband) - note sure how to share !

Downstream data:

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	203000000	0.7	35	256 qam	9
2	211000000	1	33	256 qam	10
3	219000000	0.5	32	256 qam	11
4	227000000	0.7	33	256 qam	12
5	235000000	0.4	34	256 qam	13
6	243000000	0.5	35	256 qam	14
7	251000000	-0.2	34	256 qam	15
8	259000000	0.5	34	256 qam	16
9	267000000	0.2	36	256 qam	17
10	275000000	0.9	36	256 qam	18
11	283000000	0.5	33	256 qam	19
12	291000000	0.5	31	256 qam	20
13	299000000	0.7	30	256 qam	21
14	307000000	0.7	34	256 qam	22
15	315000000	0.4	34	256 qam	23
16	323000000	0.9	34	256 qam	24
17	331000000	1.2	35	256 qam	25
18	371000000	1.2	36	256 qam	26
19	379000000	1.2	36	256 qam	27
20	387000000	0.4	36	256 qam	28
21	395000000	1	37	256 qam	29
22	403000000	0.2	37	256 qam	30
23	411000000	0.7	37	256 qam	31
24	419000000	-0.2	37	256 qam	32

Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	35	754	0
2	Locked	34.3	33852	0
3	Locked	32.9	562022	0
4	Locked	33.9	26159	0
5	Locked	34.3	74443	0
6	Locked	34.4	58169	0
7	Locked	34.9	16972	0
8	Locked	35.5	806	0
9	Locked	36.6	1	0
10	Locked	36.6	4	0
11	Locked	34.3	217826	0
12	Locked	31.9	12895741	24546
13	Locked	29.3	22583409	10771697
14	Locked	34.4	136482	0
15	Locked	34.3	123948	0
16	Locked	34.9	13519	0
17	Locked	34.9	11301	0
18	Locked	36.3	17	0
19	Locked	36.3	4	0
20	Locked	36.6	0	0
21	Locked	37.3	4	0
22	Locked	37.3	0	0
23	Locked	37.3	0	0
24	Locked	37.6	1	0

[Andrew-G · Accepted solution]

You have a noise ingress problem around 300 MHz (downstream channels 12 & 13), causing poor SNR on those and some surrounding channels.  The source of that is probably military communications, but it will be coming into the network through a faulty joint, damaged cable maybe even an unterminated coax cable.  Check that your coax lead to the hub is securely fitted and the securing nut is finger tight, unless that works wonders then you'll probably need a technician booking to come and sort it out.  I'll flag your post for staff to advise.

Edit: The staff will probably want the hub running in router mode as they can't interrogate the hub status in modem mode.  If you need to do that, might be expedient to have the hub in router mode and the Draytek in access point mode (if it's the wifi model) until the VM connection issue is fixed.

[Alex_RM]

Hi jwither42,

Thanks for posting and sorry to hear you're having some issues with your connection.

I've been able to locate your account using your forum details, so I can run through diagnostics are you able to pop the hub back into router mode as Andrew-G has suggested?

Alex_Rm

[jwither42]

Thanks both,

Have reconnected to wall box and Hub - have ordered a new cable in case damaged - will try that and then come back to you Alex.

Thanks

James.

[Zach_R]

Hi @jwither42,

No problem. Please do keep us posted with how you get on either way.

Thanks,